Furnace



(No Model.)

s. s. HERSBY.

FURNACE.

Patented Nov. 13, 1888.

SAMUEL S. HERSEY, OF AUBURN, MAINE.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 392,804, dated November13, 1888.

Application filed June 23, 1888. Serial No. 278,008. (No model.)

To aZZ whom it may concern.-

Be it known that I, SAMUEL S. HERsEY, of Auburn, in the county ofAndroscoggin and State of Maine, have invented an Improvement inFurnaces, of which the following deseription, in connection with theaccompanying drawings, is a specification, likeletters on the drawingsrepresenting like parts.

This invention relates to furnaces of that class in which asteam-generator and hot-air heater are combined in such manner thateither may be used separately or both may be used together to produce amaximum heating effect.

My invention has for its object to construct a furnace of the classreferred to, as will be described, whereby the same is readilyaccessible, so that it may be easily cleansed or repaired when required.

My invention therefore consists, essentially, in a furnace, atcombustionchamber or firebox. a substantially horizontal boiler, andenveloping plates or shells,to form with the said boiler chambers orpassages communicating with the firebox, combined with an envelopingshell forming with the said plates or shells an air-chamber, and withremovable caps or covers for the ends of the said shells and boiler,substantially as will be described.

Other features of my invention will be hereinafter pointed out in theclaims at the end of this specification.

Figure l is a vertical longitudinal section of a furnace embodying myinvention; Fig. 2, a rear end view of the furnace shown in Fig. 1; Fig.3, a rear end view ofthe furnace shown in Fig. 1 with the outer capremoved; Fig. 4, a rear end view of the furnace shown in Fig.

-l with the outer and inner caps removed;

Fig. 5, a front end view of the furnace shown in Fig. 1; Fig. 6, a frontend view of the furnace shown in Fig. 1 with the front cap removed, andFig. 7 a top or plan View of the grate removed.

The base a, herein shown as a hollow frame or casting, preferably ofiron, has secured to its opposite ends in any suitable manner, as byrivets, castings a a. The castings a a are provided with openings forthe reception of the ends of a substantially horizontal steamgenerator,herein shown as the fire-tube boiler a, of any usual or well knownconstruction,

the said boiler being supported at one end, herein shown as the rearend, by lugs a, on a metal plate or shell, a supported by the saidcastings, the opposite or front end of the boiler being supported by thecasting a and by flanges a (see Fig. 6) on the said. plate, the saidboiler being thus inclined from its rear toward its front end tofacilitate the passage of the products of combustion through thefire-tubes a.

The metallic plate or shell a is provided near the front end of theboiler, as herein shown, with a preferably circular opening, (see Fig.1,) about which is extended a depend ing flange, I), having secured toor forming part of it a cylinder or box, I), which in practiceconstitutes the fire-box of the furnace, the grate b of the saidfire-box being supported, as shown, in a removable frame or casting, 6(see Fig. 7,) adapted to be fitted into the front end of the base a, thesaid casting being of suitable depth to form the ash-pit b, having itsbottom composed, preferably,of east-iron,b

The metallic plate a in practice will preferably extend under and aboutthe lower half of the boiler, and the upper edges or sides of the saidplate are bent inward toward the boiler, as at 2, (see Fig. 6,) and areluted or otherwise rendered air-tight therewith, whereby the space orchamber I) between the plate a and thelower half of the boiler ismaintained separate and distinct from a chamber or space,

b formed by a plate, a, and the upper half of the boiler, the said platehaving its ends supported, as shown, by flanges c c on the inner side ofthe end castings, a cf, the edges of the said plate being soldered 0rluted or otherwise secured to the inturned edges 2 of the plate a Thefront end casting, a, has on its outer side a flange, 0 upon which isfitted a cap formed, as shown, by plates 0" 0 the plate 0* forming withthe front head of the boiler a passage, 0, through which pass theproducts of combustion, the plates 0 c forming a chamber, 0, for thepassage of air, as will be described. The rear casting, a, is providedon its outer side with a flange, d, upon which is fitted a cover, d, thespace between said cover and the rear head of the boiler being divided,as shown, into two chambers, d d, (see Fig. 1,) by the plate d".

The chamber (2 has an outlet-pipe, (1*, ex-

tended through a flange, 11", secured to the casting a", the said flangehaving fitted upon it a cap or cover, (1, which forms around the saidflange a chamber, d which communicates through suitable slots, (i in thecasting a" with an air chamber or space, d", surrounding the boiler, thesaid air-chamber being formed by a shell, d secured air-tight to thecastings a a and to the base a, the said shell being provided with oneor more outlets, d, to which are connected the distributing pipe orpipes leading to different parts of the building to be heated, and notherein shown.

In operation the products of combustion pass from the fire-box into thespace I) below the boiler, as indicated by arrow 20, thence into thechamber cl,through the lire-tubes into the chamber 0 at the front of theboiler, then about the upper half of the boiler, through the passage 1)into the chamber d, from which they escape through the outlet-pipe (1,comment eating with the chimney. (Not shown.) The steam generz-rted inthe boiler may be taken therefrom th rough the pipe (2, extended throughthe shell 11', and connected, as shown, to the steam-dome c. Air to beheated is admitted, as herein shown, through a suitable orifice at therear of the furnace, provided with a door, 0 the said air passing upwardaround the lire-box and boiler in the chambers or spaces d d, the said.air heated by contact with the fire-box and boiler being conducted awayby suitable pipes (not shown) connected to the outlet-pipes (2. Air maybe admitted directly into the chambers c d at the front and rear of thefurnace through suitable registers, c" c", the air in the chamber cpassing therefrom through a pipe, 0, into the chamber or passage (1.

If it is desired to clean the furnace after considerable use, the frontand rear caps, 0" (1, may be readily removed and the air'passagescleaned, and if it is desired to clean the firetubes the cap (1' mayalso be removed, thus permitting ready access to the said tubes.

To permit the grate b to be readily shaken from outside the furnace, thesaid grate has a nace and provided with a stud or pin, f, projected upthrough a slot, f (see dotted lines,

Fig. 7,) in the casting I), (see Figs. 1 and 7,) the said stud or pinhaving mounted on it a slide, f, and having connected to it, as by apin, (see Fig. 7,) a levcr,f", pivoted to a second lever or handle, ffulcrnmed, as herein shown at f to a 1ug, secured to or forming part ofthe casting.

I claim-- 'I.. In a furnace, a combustion-chamber or fire-box, ahorizontal boiler, plates or shells to form with the said boilerchambers or passages I) If, communicating with the fire-box, and anenveloping shell forming with the said plates or shells an air-chamber,combined with removable covers or caps for the ends of the said shellsand boiler, whereby the said boiler and shells may be readily inspectedand cleansed, substantially as described.

2. In a furnace, a base and end castings, a a, secured thereto, ahorizontal fire-tube boiler supported thereby, plates or shells a c,secured to said castings and forming with the said boiler chambers orpassages for the products of combustion, a front cap, 0'', and rear capor cover, d, combined with an enveloping shell secured to said base andforming an air-chamber, substantially as described.

3. In a furnace, a base and end castings, a a ,secured thereto, ahorizontal fire-tube boiler supported thereby, plates or shells a c,secured to said castings and forming with the said boiler chambers orpassages for the products of combustion, a flange,'d, dividing-walls d,and cap or cover (1, and front cap, o combined with an enveloping shell,d", a flange, (l and cover (1, substantially as described.

In testimony whereof Ihave signed my name to this specification in thepresence of two subscribing witnesses.

SAM U EL S. HERSEY.

\Vi tn csses G nonon E. INGERSOLL, Rosco]; A. BAGIIELLIGR.

